计算对象数组中重叠日期的最大数量

function calculateMaxOverlap(objects) {
  // 将日期字符串转换为日期对象
  objects.forEach(obj => {
    obj.start = new Date(obj.start);
    obj.end = new Date(obj.end);
  });

  // 按照起始日期排序
  objects.sort((a, b) => a.start - b.start);

  let maxOverlap = 0;
  let currentOverlap = 1;

  for (let i = 1; i < objects.length; i++) {
    if (objects[i].start <= objects[i - 1].end) {
      // 存在重叠日期
      currentOverlap++;
    } else {
      // 不存在重叠日期
      currentOverlap = 1;
    }

    maxOverlap = Math.max(maxOverlap, currentOverlap);
  }

  return maxOverlap;
}

// 示例计算对象数组
const objects = [
  { start: '2022-01-01', end: '2022-01-05' },
  { start: '2022-01-03', end: '2022-01-07' },
  { start: '2022-01-06', end: '2022-01-10' },
  { start: '2022-01-09', end: '2022-01-12' }
];

const maxOverlap = calculateMaxOverlap(objects);
console.log('计算对象数组中重叠日期的最大数量：', maxOverlap);